If you could manage to 'free view' those patterned Magic Eye pictures,
then you maybe able to do this.
Set up the left and right cameras in their own view windows in
the editor. By relaxing your eyes and gazing off into the distance
it is possible to see the left picture with your left eye while
at the same time seeing the right picture with your right eye. If
you do this successfully you will see the scene in stereo.
With 'Camera Right' still selected and the movement constrained
to the x axis only, gently adjust its position right and left. This
will increase and decrease the stereo effect live. Adjust it until
you like what you see. Obviously this is an advanced eye bending
technique and if you don't get it at first stick with the 1/30 rule.
At this point the stereo set up is complete.
But wait shouldn't the cameras be angled in a bit?
It is a common misconception that stereo cameras should 'toe in'.
Of course our own eyes converge all the time in real life but if
you look at something very close your eyes angle in so much that
the whole background becomes double vision. If you create a stereo
pair like this you will never be able to look into the distance
of the scene without a lot of discomfort. Another problem with 'toe
in' is the opposing keystone distortion that it creates in the left
and right images. This is especially noticeable in wide angle shots.
Have a look at the corners in these examples.